Control device and control method for spark ignition gasoline engine
A gasoline engine, spark ignition technology, applied in engine control, engine components, combustion engine, etc., can solve problems such as engine abnormal combustion
Inactive Publication Date: 2016-03-09
MAZDA MOTOR CORP
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Problems solved by technology
However, in an engine whose geometric compression ratio is set high in order to stabilize compression-ignition combustion, in the high-load-side operating region where spark-ignition combustion is performed, the engine of Patent Document 1 generates Problems that cause abnormal combustion
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[0070] Hereinafter, an embodiment of a control device for a spark ignition type gasoline engine will be described based on the drawings. The description of the following specific embodiments is an example. figure 1 , 2 The schematic structure of the engine (engine main body) 1 is shown. The engine 1 is a spark ignition type gasoline engine mounted on a vehicle and supplied with fuel containing at least gasoline. The engine 1 has a cylinder block 11 provided with a plurality of cylinders 18 (only one is shown), a cylinder head 12 provided on the cylinder block 11 , and an oil pan 13 provided below the cylinder block 11 and storing lubricating oil. A piston 14 connected to the crankshaft 15 via a connecting rod 142 is reciprocally inserted in each cylinder 18 . like image 3 The enlargement in , shows that a bowl-shaped cavity 141 is formed on the top surface of the piston 14 . The cavity 141 faces a direct injection injector 67 described later when the piston 14 is located...
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The present invention relates to a control device and a control method for a spark-ignition gasoline engine, wherein when the operating state of the engine body is in a high-load region within a low-speed region, a driving fuel pressure variable mechanism (high-pressure fuel supply system (62)) is executed. Control so that the fuel pressure is higher than the pressure at the time of the low load region in the low speed region, the control of driving the fuel injection valve (direct injection injector (67)) so as to at least include the pressure from the low load region relative to the low speed region. The injection timing of fuel is controlled to inject fuel during a delay period from the end of the compression stroke to the beginning of the expansion stroke, and control to operate the spark plug (25) so that ignition is performed during the delay period after the fuel is injected. Thereby, in the spark ignition type gasoline engine of the high compression ratio in which the geometric compression ratio is set relatively high, abnormal combustion in the high load region can be avoided.
Description
technical field [0001] The present invention relates to techniques for controlling spark ignition gasoline engines. Background technique [0002] To improve the theoretical thermal efficiency of a spark ignition gasoline engine, it is effective to increase its geometric compression ratio. For example, Japanese Patent Laid-Open Publication No. 2007-292050 (hereinafter referred to as "Patent Document 1") discloses a high compression ratio spark ignition direct injection engine in which the geometric compression ratio is set to 14 or higher. [0003] In addition, as a technique for improving both exhaust emission and thermal efficiency, there is known, for example, a combustion form in which a lean air-fuel mixture is compression-ignited as disclosed in Japanese Patent Laid-Open Publication No. 2007-154859 (hereinafter referred to as "Patent Document 2"). . In an engine that performs such compression ignition combustion, increasing the geometric compression ratio can increase...
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IPC IPC(8): F02D43/00
CPCF02M41/00F02D41/3035F02D41/3064F02D41/3094F02D41/3836F02D41/401F02D41/402F02D37/02F02D41/005F02D2041/001F02D2200/101F02M63/0225Y02T10/40
Inventor 大场秀儿岩井浩平长津和弘山川正尚太田统之渡边直哉栗田宽之藤川龙也内田健儿浅地大介长野高皓
Owner MAZDA MOTOR CORP